[24.0 backport] c8d: Make sure the content isn't removed while we export #46021
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This change add leases for all the content that will be exported, once the image(s) are exported the lease is removed, thus letting containerd's GC to do its job if needed. This fixes the case where someone would remove an image that is still being exported.
This fixes the TestAPIImagesSaveAndLoad cli integration test.
(cherry picked from commit f3a6b0f)
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